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20CrMnMo open gear, detection method thereof and heat treatment method for reducing cracks of blank forging of 20CrMnMo open gear

A heat treatment method and open gear technology, applied in heat treatment furnaces, heat treatment equipment, wheels, etc., can solve problems such as difficulty in troubleshooting, achieve the effect of reducing crack defects and improving the qualified rate of finished products

Pending Publication Date: 2021-04-16
NANJING DEV ADVANCED MFG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] 20CrMnMo open gear blank forgings can be forged into gears. However, in actual production, there are defect wave reflections inside the manufactured gears. It is of great significance to guide production to put forward guiding opinions for production, to guide production correctly, and to prevent cracks from reoccurring in production.

Method used

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  • 20CrMnMo open gear, detection method thereof and heat treatment method for reducing cracks of blank forging of 20CrMnMo open gear
  • 20CrMnMo open gear, detection method thereof and heat treatment method for reducing cracks of blank forging of 20CrMnMo open gear
  • 20CrMnMo open gear, detection method thereof and heat treatment method for reducing cracks of blank forging of 20CrMnMo open gear

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Embodiment Construction

[0086] Now, the present invention will be described in further detail in conjunction with the accompanying drawings and embodiments.

[0087] A heat treatment method for reducing cracks in 20CrMnMo open gear blank forgings, specifically comprising the following steps:

[0088] Step 1: Blank forgings: Select a billet made of 20CrMnMo with a specification of 300×300mm, as a blank forging of an open gear, and quench and temper the blank forging,

[0089] Step 2: Put the blank forging in step 1 into the furnace to heat, and then forge after heating. The initial forging temperature is 1200°C, the final forging temperature is 800°C, and the forging ratio is 7.5, specifically:

[0090] (2.1) The billet is drawn up to 600mm, upsetting to 300mm,

[0091] (2.2) Pull out again to 600mm, upsetting to 300mm,

[0092] (2.3) Then pull out and round to

[0093] (2.4) Extended and restructured as small head,

[0094] (2.5) Braised die forging molding,

[0095] (2.6) pit cold,

[0096...

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Abstract

The invention relates to a 20CrMnMo open gear, a detection method thereof and a heat treatment method for reducing cracks of a blank forging of the 20CrMnMo open gear, and belongs to the technical field of hot forging treatment processes. The heat treatment method comprises the steps that a square billet enters a furnace to be heated, the initial forging temperature is 1200 DEG C, the final forging temperature is 800 DEG C, the forging ratio is 7.5, carburization and heat preservation are conducted for 60 hours at the temperature of 930 DEG C, and the square billet is discharged out of the furnace; the square billet is quenched, wherein austenitizing is conducted, heat preservation is conducted for 4.5 hours at the temperature of 850 DEG C, and the square billet is discharged out of the furnace (oil cooling); and the square billet is tempered, wherein the square billet is heated to 210 DEG C, heat preservation is conducted for 12 hours, and the square billet is discharged out of the furnace (air cooling). The open gear is manufactured through the heat treatment method. The detection method comprises the following steps: ultrasonic flaw detection, dissection sampling, macroscopic examination, metallographic examination, hardness test, impact and tensile test, and impact fracture scanning electron microscope analysis. By means of the detection method, the crack state can be observed, the crack occurrence time can be judged, and the detection method has extremely important production guidance significance.

Description

technical field [0001] The invention relates to a 20CrMnMo open gear, a detection method thereof and a heat treatment method for reducing the cracks of its billet forging, belonging to the technical field of hot forging treatment technology. Background technique [0002] 20CrMnMo open gear blank forgings can be forged into gears. However, in actual production, there are defect wave reflections inside the manufactured gears. It is of great significance to guide production to put forward guiding opinions for production, correctly guide production, and prevent cracks from recurring in production. Contents of the invention [0003] In order to solve the above-mentioned technical problems, the present invention provides a kind of 20CrMnMo open gear and its detection method and the heat treatment method of reducing the crack of its billet forging, and its specific technical scheme is as follows: [0004] A heat treatment method for reducing cracks in 20CrMnMo open gear blank fo...

Claims

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Application Information

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IPC IPC(8): C21D1/18C21D9/32C23C8/00B21K1/30G01B21/02G01B21/20G01N3/06G01N3/08G01N3/30G01N3/40G01N21/88G01N29/04
Inventor 陈昌华张利张洪孔德贵陈海山宋雷钧哈曜陈洁陈友坤施虹屹闵明汪海潮张思瑞刘晓磊龚洋道
Owner NANJING DEV ADVANCED MFG
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